Общий каталог Tungaloy 2020 - 2021 - страница 1662

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Parts for ToolsTechnicalReference Abnormal wearChipping and fracture User’s Guide - Technical Reference Drilling To o l s Tr o u b l e s h o o t i n g for solid carbide drills Problem Cause Countermeasure Inappropriate cutting speed •Increase the cutting speed by 10 % within standard conditions if abnormal wear is around center. •Lower the cutting speed by 10 % within standard conditions if abnormal wear is on the periphery. Relief surface Inappropriate cutting fluid •Check the filter. •Use the cutting fluid superior in lubricity. (Increase the dilution rate) Inappropriate cutting speed •Lower the cutting speed by 10 %. Regrinding timing, insufficient reground amount •Shorten the regrinding timing. Insufficient rigidity of the machine and workpiece •Change the clamp method to the one with rigidity. Insufficient drill rigidity •Use smallest possible overhang. Margin Inappropriate cutting fluid •Check the filter. •Use the cutting fluid superior in lubricity. (increase the dilution rate) Intermittent cutting when entering •Avoid interruption at entry and exit. •Lower the feed by about 50 % during entering into and leaving from the workpiece. Insufficient rigidity of the drill •Reduce the drill overhang as much as possible. •Increase the feed at entry when the low speed feed is selected in standard cutting condition range. •Use a bushing or a center drill. Chisel section Insufficient rigidity of the machine and workpiece •Change the clamp method to the one with rigidity. (center of drill Inappropriate entry into •Avoid interruption at entry into the workpiece. cutting edge) the workpiece •Lower the feed by 10 % at entry. High workpiece hardness •Lower the feed by 10 %. Inappropriate honing •Check if honing has been made to the center of cutting edge. Insufficient drill rigidity •Lower the cutting speed by 10 %. •Increase the feed at entry when the low speed feed is selected in standard cutting condition range. Peripheral Inappropriate drill mounting accuracy •Check the run out accuracy after drill installation. (0.03 mm or less) cutting edge Insufficient machinery •Change the clamp method to the one with rigidity. and workpiece rigidity •Lower the feed during entering into and leaving from the workpiece. Inappropriate honing •Check if honing has been made to the cutting edge periphery. Insufficient machine and workpiece rigidity •Change the clamp method to the one with rigidity. Insufficient drill rigidity •Use smallest possible overhang. •Use a bushing or center drill. Margin Regrinding timing and insufficient amount of reground stock •Shorten the regrinding timing. Intermittent cutting when •Avoid interruption at entry and exit. entering or exiting the cut •Lower the feed by about 50 % during entering into and leaving from the workpiece. Tendency to cause chipping or •Check the failure mode condition before breakage and find out the wear and develop abnormal wear chip countermeasures. Chip packing in the drill flutes •Review the cutting conditions. Breakage •For internal coolant supply, raise the supply pressure of cutting fluid. •Use peck feed for deep holes. Insufficient machine output •Review the cutting conditions. •Use the machine with high power. Insufficient rigidity of the machinery and workpiece •Change to the clamp method with rigidity Inappropriate drill installation accuracy •Check the run out accuracy of drill mounting. (0.03 mm or less) Insufficient hole Chip packing in the flutes. •Review the cutting conditions. accuracy •Raise the cutting oil supply pressure. •Use peck-feed for deep holes. Inappropriate edge sharpening accuracy •Check the edge shape accuracy. Inappropriate cutting conditions •Increase the feed by 10 % within standard conditions. Prolonged chips Inappropriate honing •Provide the appropriate honing. Cutting edge with chipping or breakage •Lower the cutting speed by 10 %. L074 www.tungaloy.com